外部空洞部を複数並置した円形ダクトにおける放射音場特性(流体工学,流体機械)

概要

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The sound characteristics of the radiated waves from the open end of the duct with cavities have been studied numerically and experimentally for various depths of the cavities in connection with the sound reduction for the wide ranged frequencies. The sound pressure level (SPL), time history of the sound pressure and acoustic energy flux vector, i.e., instantaneous intensity, etc., are computed by a finite difference method. The present study shows that the lager depth of the nearest cavity from the duct yields the best configuration for the reduction of radiated power in the wide ranged frequencies. The present result also shows that the instantaneous intensity makes clear the interaction of the duct and each cavity. It is confirmed that the sound wave at the open end of the resonating cavity and the one of the duct are nearly equal in magnitude but reverse in phase. The computed results are in good agreement with experimental data.
社団法人日本機械学会の論文
2003-05-25